Failed to delete shard data for shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.5

Briefly, this error occurs when Elasticsearch is unable to delete the data associated with a specific shard. This could be due to insufficient permissions, disk space issues, or a network problem. To resolve this, you can try the following: 1) Check and adjust the permissions of the Elasticsearch data directory. 2) Free up disk space if it’s running low. 3) Check the network connectivity between the nodes if you’re running a cluster. 4) Restart the Elasticsearch service. Always ensure to backup your data before performing these operations to prevent data loss.

This guide will help you check for common problems that cause the log ” [{}] failed to delete shard data for shard [{}][{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories, delete, shard, blobstore.

Log Context

Log “[{}] failed to delete shard data for shard [{}][{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                    deleteShardSnapshot(repositoryData; indexId; shard; snapshotId));

                            public void onFailure(Exception ex) {
                                logger.warn(() -> new ParameterizedMessage("[{}] failed to delete shard data for shard [{}][{}]";
                                    snapshotId; indexId.getName();; ex);
                                // Just passing null here to count down the listener instead of failing it; the stale data left behind
                                // here will be retried in the next delete or repository cleanup


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